// -*- c++ -*-
/* $Id: container.ccg,v 1.12 2006/07/19 16:58:50 murrayc Exp $ */

/* Copyright 1998-2002 The gtkmm Development Team
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <gtkmm/adjustment.h>
#include <gtk/gtk.h>


namespace
{

static void container_foreach_callback(GtkWidget* widget_gobj, void* data)
{
  try
  {
    Gtk::Container::ForeachSlot& slot = *static_cast<Gtk::Container::ForeachSlot*>(data);
    Gtk::Widget *const widget = Glib::wrap(widget_gobj);

    g_return_if_fail(widget != 0);

    slot(*widget);
  }
  catch(...)
  {
    Glib::exception_handlers_invoke();
  }
}


//Copy of generated callback:
static void Container_signal_remove_callback_normal(GtkContainer* self, GtkWidget* p0,void* data)
{
  using namespace Gtk;
  typedef sigc::slot< void,Widget* > SlotType;

  // Do not try to call a signal on a disassociated wrapper.
  if(Glib::ObjectBase::_get_current_wrapper((GObject*) self))
  {
    try
    {
      if(sigc::slot_base *const slot = Glib::SignalProxyNormal::data_to_slot(data))
        (*static_cast<SlotType*>(slot))(Glib::wrap(p0)
);
    }
    catch(...)
    {
      Glib::exception_handlers_invoke();
    }
  }
}

static void Container_signal_remove_callback(GtkContainer* self, GtkWidget* p0, void* data)
{
  //GTKMM_LIFECYCLE

#ifdef GLIBMM_DEBUG_REFCOUNTING
  g_warning("Container_signal_remove_callback()");
#endif

  //Don't call wrap() on a GTK+ instance whose gtkmm instance has been deleted - just call the original C callback.
  const bool gtkmm_child_already_deleted = Glib::_gobject_cppinstance_already_deleted((GObject*)p0);

  if(!gtkmm_child_already_deleted)
  {
    //Call the regular, generated callback:
    Container_signal_remove_callback_normal(self, p0, data);
  }
  else
  {
    //Do nothing.
  }
}

} // anonymous namespace


namespace Gtk
{

//Copy of generated callback:
void Container_Class::remove_callback_normal(GtkContainer* self, GtkWidget* p0)
{
  CppObjectType *const obj = dynamic_cast<CppObjectType*>(
      Glib::ObjectBase::_get_current_wrapper((GObject*)self));

  // Non-gtkmmproc-generated custom classes implicitly call the default
  // Glib::ObjectBase constructor, which sets is_derived_. But gtkmmproc-
  // generated classes can use this optimisation, which avoids the unnecessary
  // parameter conversions if there is no possibility of the virtual function
  // being overridden:
  if(obj && obj->is_derived_())
  {
    try // Trap C++ exceptions which would normally be lost because this is a C callback.
    {
      // Call the virtual member method, which derived classes might override.
      obj->on_remove(Glib::wrap(p0)
);
    }
    catch(...)
    {
      Glib::exception_handlers_invoke();
    }
  }
  else
  {
    BaseClassType *const base = static_cast<BaseClassType*>(
        g_type_class_peek_parent(G_OBJECT_GET_CLASS(self)) // Get the parent class of the object class (The original underlying C class).
    );

    // Call the original underlying C function:
    if(base && base->remove)
      (*base->remove)(self, p0);
  }
}

//Custom hand-coded callback:
void Container_Class::remove_callback(GtkContainer* self, GtkWidget* p0)
{
  //GTKMM_LIFECYCLE

#ifdef GLIBMM_DEBUG_REFCOUNTING
  g_warning("Container_Class::remove_callback_custom() C self=%p: C child=%p\n", (void*)self, (void*)p0);
  g_warning("gtypename self: %s\n, gtypename child: %s", G_OBJECT_TYPE_NAME(G_OBJECT(self)), G_OBJECT_TYPE_NAME(G_OBJECT(p0)));
#endif
  
  //Don't call wrap() on a GTK+ instance whose gtkmm instance has been deleted - just call the original C callback.
  const bool gtkmm_child_already_deleted = Glib::_gobject_cppinstance_already_deleted((GObject*)p0);

  if(!gtkmm_child_already_deleted)
  {
    //Call the regular, generated callback:
    Container_Class::remove_callback_normal(self, p0);
  }
  else
  {
    BaseClassType *const base =
      static_cast<BaseClassType*>(g_type_class_peek_parent(G_OBJECT_GET_CLASS(self)));

    // Do not try to call the default implementation of the virtual function
    // GtkContainerClass::remove(), because it unhelpfully informs us that
    // it isn't implemented.  This leaves us with no generic means to check
    // whether it is implemented.
    if(base && G_TYPE_FROM_CLASS(base) != GTK_TYPE_CONTAINER && base->remove)
      (*base->remove)(self, p0);
  }
}

void Container::foreach(const Container::ForeachSlot& slot)
{
  ForeachSlot slot_copy (slot);
  gtk_container_foreach(gobj(), &container_foreach_callback, &slot_copy);
}

void  Container::add(Widget& widget)
{
  gtk_container_add(gobj(), widget.gobj());
}

bool Container::has_focus_chain() const
{
  return gtk_container_get_focus_chain(const_cast<GtkContainer*>(gobj()), 0);
}

Glib::ListHandle<Widget*> Container::get_focus_chain()
{
  GList* list = 0;
  gtk_container_get_focus_chain(gobj(), &list);

  return Glib::ListHandle<Widget*>(list, Glib::OWNERSHIP_SHALLOW);
}

Glib::ListHandle<const Widget*> Container::get_focus_chain() const
{
  GList* list = 0;
  gtk_container_get_focus_chain(const_cast<GtkContainer*>(gobj()), &list);

  return Glib::ListHandle<const Widget*>(list, Glib::OWNERSHIP_SHALLOW);
}


void Container::show_all_children(bool recursive)
{
  // Plain C version if this turns out to be performance-critical:
  //GtkCallback callback = (GtkCallback) ((recursive) ? &gtk_widget_show_all : &gtk_widget_show);
  //gtk_container_foreach(gobj(), callback, 0);

  // This could also be done with get_children() and an explicit loop,
  // if any problems should arise.  In gtkmm-1.2, foreach() is known to
  // cause segfaults eventually, but it seems to work now.

  foreach(sigc::mem_fun((recursive) ? &Widget::show_all : &Widget::show));
}

void Container::remove(Widget& widget)
{
  //If this is a managed widget,
  //then do an extra ref so that it will
  //not be destroyed when adding to another container
  //This should leave it in much the same state as when it was instantiated,
  //before being added to the first container.
  if(widget.is_managed_())
    widget.reference();
    
  gtk_container_remove(gobj(), widget.gobj());
}

// static
void Container_Class::destroy_callback(GtkObject* self)
{
#ifdef GLIBMM_DEBUG_REFCOUNTING
  g_warning("Container_Class::destroy_callback() gobject_=%10X\n", self);
  if(self)
    g_warning("gtypename: %s\n", G_OBJECT_TYPE_NAME(G_OBJECT(self)));
#endif

  //Call the normal C destroy implementation, such as gtk_button_destroy:
  //This will chain to gtk_container_destroy(), which will gtk_widget_destroy() any remaining child widgets.
  GtkObjectClass *const base = static_cast<GtkObjectClass*>(
      g_type_class_peek_parent(G_OBJECT_GET_CLASS(self)));

  if(base->destroy)
    (*base->destroy)(self);
}

} // namespace Gtk

